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Period T

The program computes T for both orthogonal force directions according to NBC 4.1.8.11 3 c)

T = 0.05 (hn)3/4

This value appears as the default value in the Site Dialog input for T, and you can override it with one you have calculated using deformation analysis by unchecking the Calculate T button. It is possible to specify a different T in each force direction.

See Also

Site Information

Importance Category

Site Classes - US

Force Modification Factors Ro and Rd

Spectral Response Accelerations - Canada